LVIV – In the world of jazz, there are a number of summer festivals that stand out as the most prestigious venues for emerging artists as well as established superstars. For decades, Montreux in Switzerland; Newport, R.I.; and Monterey, Calif., have been recognized as meccas that attract the finest jazz talents from around the world. But unbeknownst to much of the Ukrainian diaspora, Lviv has established itself as an elite stop for jazz aficionados and performers alike.